Running trailer lights not working, but brake lights on trailer do..
Did you check the fuse for the trailer tow adapter paring lamps ? This is a separate fuse powered by a relay, it is not the same circuit as the truck's parking lamps.
This is fuse # F10 & The half size ISO relay, R201 in the fuse panel in the passenger side kick panel.
This is based upon being a new body style 2004, not the 2004 Heritage or Lightning models, those are different fuse & relay locations.
My truck is a 2009 ford f 350
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Running lights on your trailer are on the same circuit as your vehicle running lights. In other words, your tow vehicle lights must be on to have the trailer running lights on.
Check your ground and check the pin on your plug ... do you have power on the towed vehicle plug with the lights on? If yes, when you plug in your trailer, you should be able to power the running lights as well.
Like I said, check grounds and if that doesn't work ... check the lamps in each fixture.
All the lights work on the 2009 f350 but the trailer lights don't work. The trailer lights work when I plug it in to my other truck
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SOURCE: plugging in trailer there are not running lights to trailer
Could be a bad ground. Check the bulbs too.
SOURCE: back-up lights and trailer running lights
My 2004 f150 has the factory tow package. It has a fuse for the trailer running lights seperate from the truck running light fuse.
Check, you may have the same set up...
SOURCE: trailer light hook up problem
It sounds like your have may have your brake light and running lights crossed on your wiring harness to the trailer. Good luck and hope this help's
SOURCE: 2001 Dodge Ram 2500, no running lights on trailer
The truck is protecting itself from the load impose by the trailer.. Chk the plug on the truck for wire gauge size. Turn any electrical loads off on the trailer, any and all. If fuse still blows then the fuse is either underated or the trailer has a dead short. In fact turn trail main power panel of. All lights work you say. So ck the inverter for defect byturning off the inverter on one of the trailers.
SOURCE: My trailer running lights will not work.
sounds like a loose wire in the trailor socket ,the amount i repaired and i cant remember which number it is in the plug its either the red or the brown but as iam colour blind in these colours i always use a test light ,also check the wire where its strapped at the front of the trailor as they often chaffe here
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